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In classical electromagnetism, magnetization or magnetic polarization is the vector field that expresses the density of permanent or induced magnetic dipole moments in a magnetic material. The origin of the magnetic moments responsible for magnetization can be either microscopic electric currents resulting from the motion of electrons in atoms, or the spin of the electrons or the nuclei. Net magnetization results from the response of a material to an external magnetic field. Paramagnetic materials have a weak induced magnetization in a magnetic field, which disappears when the magnetic field is removed. Ferromagnetic and ferrimagnetic materials have strong magnetization in a magnetic field, and can be magnetized to have magnetization in the absence of an external field, becoming a permanent magnet. Magnetization is not necessarily uniform within a material, but may vary between different points. Magnetization also describes how a material responds to an applied magnetic field as well as the way the material changes the magnetic field, and can be used to calculate the forces that result from those interactions. It can be compared to electric polarization, which is the measure of the corresponding response of a material to an electric field in electrostatics. Physicists and engineers usually define magnetization as the quantity of magnetic moment per unit volume. It is represented by a pseudovector M.
Detection method of ocean magnetic field sensor based on diamond NV color center
ActiveCN121164991AMagnetic field measurement using flux-gate principleMagnetic field measurement using galvano-magnetic devicesFrequency spectrumPoint light
The invention discloses a detection method of an ocean magnetic field sensor based on a diamond NV color center. The detection method comprises the following steps: S1, calibrating a base line; s2, alternately measuring fluorescence between two single quantum resonance frequencies, and obtaining a difference to realize DQ reading; s3, three-axis compensation current is adjusted based on closed-loop control, and the NV working point is maintained at zero magnetization bias; s4, obtaining background magnetic field change through digital demodulation and adaptive filtering; and S5, calculating a gradient based on the spatial difference of the multi-point light spots, judging the existence and trajectory of the underwater vehicle in combination with a threshold value and a spectrum matching method, calibrating the threshold value according to the magnetic field characteristics of the existing underwater vehicle, adopting short-time Fourier transform signal spectrum, comparing the threshold value with known submarine characteristic spectrum data, and prompting if the similarity exceeds a set threshold value. According to the detection method, the measurement precision and the anti-interference capability can be improved, and the method is suitable for real-time monitoring of weak magnetic anomalies (such as magnetic moment disturbance of an underwater vehicle).
Owner:OCEANOGRAPHIC INSTR RES INST SHANDONG ACAD OF SCI
Elevator steel wire rope detection device and detection method thereof
The invention discloses an elevator steel wire rope detection device and method, and the device comprises the following steps: firstly, carrying out the pre-scanning of an initial magnetic field, then carrying out the magnetization of a steel wire rope through a multi-stage adjustable electromagnet, and controlling the magnetization intensity through a current; the method comprises the following steps: firstly, pre-scanning a magnetic field, then, carrying out real-time monitoring and feedback control on the magnetized magnetic field, carrying out synchronous acquisition through a multi-modal sensor, then, extracting multi-domain features, receiving a feature vector set by a model, carrying out dynamic weighting operation on the feature vector set, and finally, outputting a task. The problem that initial magnetic fields of the steel wire ropes are inconsistent can be effectively solved, data are synchronously collected through the multi-mode sensor, effective distinguishing and quantitative evaluation of different types of defects such as wire breakage, abrasion, corrosion and fatigue damage are achieved, and the defects of an existing detection mode in defect subdivision and quantification are overcome.
Owner:ZHEJIANG ZHONGTENG TESTING TECH CO LTD
Brown relaxation dominated magnetic nanoparticle nonlinear biological information parameter estimation method
The invention provides a Brown relaxation dominated magnetic nanoparticle nonlinear biological information parameter estimation method. The method comprises the following steps: putting a container of a magnetic nanoparticle sample into a to-be-detected object area; applying low and medium frequency alternating current magnetic field excitation to the magnetic nanoparticle sample; collecting magnetization response information of the magnetic nanoparticle sample in real time and extracting harmonic amplitude information from the magnetization response information; carrying out series expansion on the Fokker-Planck equation by using a disturbance expansion method, and deducing a harmonic analytical expression under the Brown relaxation condition; respectively establishing a corresponding temperature estimation model and a hydrodynamic diameter estimation model on the basis of the harmonic analytical expression; respectively substituting the measured harmonic amplitude information into a temperature estimation model or a hydrodynamic diameter estimation model based on a harmonic analytical expression; and respectively solving an equation set formed by the temperature estimation model or the hydrodynamic diameter estimation model to obtain temperature information or hydrodynamic diameter information. According to the invention, the measurement precision and the time resolution of the magnetic nanometer temperature measurement and biomarker identification tool can be improved.
Owner:ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
Alternating-current electromagnetic field stress measurement system and method
PCT designated stageWO2026012519A1Programme controlForce measurement by measuring magnetic property varationAC - Alternating currentMagnetization
An alternating-current electromagnetic field stress measurement system, comprising: an excitation signal generation module, an alternating-current electromagnetic field stress measurement stress probe, a signal amplification circuit, an A / D conversion circuit and a processor, wherein the excitation signal generation module is used for loading a sinusoidal alternating-current signal to an excitation coil of the alternating-current electromagnetic field stress measurement stress probe, such that a periodically changing electric field is generated on a measured magnetic object; the alternating-current electromagnetic field stress measurement stress probe is used for sequentially routing a stress characterization signal, which is detected from the measured magnetic object, through the signal amplification circuit and the A / D conversion circuit, and then sending the stress characterization signal to the processor; and the processor is used for processing the received stress characterization signal by using an optimized J-A model in which an implicit equation originally characterizing a change in the magnetization intensity or magnetic induction intensity along with stress is made explicit, so as to calculate the stress of the measured magnetic object. The alternating-current electromagnetic field stress measurement system can monitor the stress increase trend in real time, and notice potential dangers in time. Further comprised is an alternating-current electromagnetic field stress measurement method and a computer program for executing the alternating-current electromagnetic field stress measurement method.
Owner:PIPECHINA SOUTH CHINA CO +1
Anti-magnetic suspension accelerometer device based on quasi-zero stiffness structure and measurement method
PendingCN121142094AAcceleration measurement using interia forcesSpeed/acceleration/shock instrument detailsAxial displacementAccelerometer
The invention discloses an anti-magnetic suspension accelerometer device based on a quasi-zero stiffness structure and a measurement method, and belongs to the field of precise instruments and meters. The device comprises a support, an axial displacement platform, magnetic conductive soft iron, an upper-layer pyrolytic graphite sheet, a lower-layer thin bismuth wafer, a capacitance displacement sensor and a permanent magnet array, wherein an anti-magnetic suspension system, a magnetic rigidity regulation and control system and a displacement detection system are arranged in the support; the anti-magnetic suspension system is composed of an upper-layer pyrolytic graphite sheet, a lower-layer thin bismuth wafer and a permanent magnet array, the magnetization directions of an inner ring and an outer ring of the permanent magnet array are opposite, a suspension element is suspended by virtue of anti-magnetic force and gravity balance, and quasi-zero stiffness is realized through positive and negative stiffness offset; according to the regulation and control mode, the magnetic field of the air gap where the suspension element is located is adjusted by adjusting the distance between the magnetic conductive soft iron and the permanent magnet, and the magnitude and gradient of magnetic induction intensity in all directions are changed, so that the magnetic rigidity is regulated and controlled, and efficient and accurate regulation and control of the sensitivity and the measuring range of the anti-magnetic suspension accelerometer are achieved. Therefore, the application range of the anti-magnetic suspension accelerometer is expanded.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Magnetic sensor element, magnetic sensor, and magnetic sensor device
A magnetic sensor element includes a pinned layer, a first non-magnetic layer, a first magnetic layer, and a free layer. The pinned layer has a fixed magnetization direction. The first non-magnetic layer is laminated on the pinned layer. The first magnetic layer holds the first non-magnetic layer with the pinned layer. The free layer is disposed along a lamination direction in which the first non-magnetic layer is laminated on the pinned layer. Each of the first magnetic layer and the free layer has a magnetization direction more easily changed by an external magnetic field than that of the pinned layer. The pinned layer and the first magnetic layer are coupled by indirect exchange interaction.
Owner:MITSUBISHI ELECTRIC CORP
Magnetoelectronic device for generating orbit torque by using vanadium or titanium-based orbit Hall effect and manufacturing method thereof
The invention discloses a magnetic electronic device for generating track torque by using a metal vanadium or titanium track Hall effect and a manufacturing method thereof. The device comprises a substrate, a track Hall structure containing a vanadium or titanium layer, and a heavy metal layer and a ferromagnetic layer which are adjacent to the track Hall structure, when a charge current passes through the vanadium or titanium layer, a transverse track current is generated based on the track Hall effect, and the track current is injected into the ferromagnetic layer and then converted into an effective track torque for controlling the magnetization state of the ferromagnetic layer. Preferably, the ferromagnetic layer has a perpendicular magnetic anisotropy. According to the invention, the light transition metal vanadium or titanium is used as the track Hall material, the experiment proves that a huge track Hall angle greater than 0.45 can be obtained, and meanwhile, the resistivity of the material is lower, so that the shunting phenomenon can be reduced in an actual device, and the critical current density for realizing write-in flipping can be obviously reduced. The device is simple in structure and compatible with an existing semiconductor process, and a brand new material platform is provided for developing a low-power-consumption and high-density magnetic random access memory (MRAM).
Owner:NANJING UNIV +1
Muon and aeromagnetic data fusion three-dimensional imaging method, medium, equipment and product
The invention provides a muon and aeromagnetic data fusion three-dimensional imaging method, a medium, equipment and a product, and relates to the technical field of geological exploration, the method comprises the following steps: dividing an object to be measured into a plurality of voxels with the same volume, and calculating the magnetization intensity and density value of each voxel according to aeromagnetic detection data and muon detection data; obtaining a magnetism-density physical parameter model; according to the magnetism-density physical parameter model, aeromagnetic inversion and muon inversion are carried out, and an objective function of aeromagnetic inversion and an objective function of muon inversion are established; establishing a joint constraint term, and combining the target function of aeromagnetic inversion and the target function of muon inversion to construct a target function of joint inversion; and solving the joint inversion target function to obtain an optimal magnetism-density value, and imaging the three-dimensional magnetism-density structure distribution in the geomorphic mineral product. According to the method, the magnetic and density abnormal structures in the complex landform can be determined at the same time, and the precision of the geophysical exploration technology is improved.
Owner:CHINA UNIV OF GEOSCIENCES (WUHAN)
Method for simulating and predicting demagnetization rate of neodymium iron boron permanent magnet based on physical field
ActiveCN121031158ADesign optimisation/simulationSpecial data processing applicationsData setMagnetization
The invention discloses a method for simulating and predicting the demagnetization rate of a neodymium iron boron permanent magnet based on a physical field. The method comprises the following steps: establishing a three-dimensional model of a magnetic circuit of the permanent magnet, and calculating magnetic field distribution data; obtaining H field intensity of the N sampling points in the magnetization direction, and performing normalization processing to obtain an H / Jr ratio; arranging the H / Jr ratios of the N sampling points from small to large to obtain an H / Jr data set, and averagely distributing the total volume of the neodymium iron boron permanent magnet to the N sampling points; constructing a V (H / Jr) cumulative volume distribution curve; constructing a new relation curve V (H / Jr * (1-V)); and testing Hk and Jr of an actually produced neodymium-iron-boron permanent magnet blank at the demagnetization heat preservation temperature, and substituting the ratio Hk / Jr as a horizontal coordinate value into the new relation curve V (H / Jr * (1-V)) to obtain a predicted value of the demagnetization rate. The method is good in universality, quantitative characterization can be carried out on the demagnetization rate of the neodymium iron boron permanent magnet with a specific geometrical shape and magnetic circuit design, and quantitative and numerical accurate prediction of the demagnetization rate is achieved.
Owner:JINLI PERMANENT MAGNET (NINGBO) TECH CO LTD +1
Magnetic superconducting memory and preparation method and read-write method thereof
The invention provides a magnetic superconducting memory and a preparation method and a read-write method thereof. According to the magnetic superconducting memory, the superconducting layer maps the magnetization state by using the resistance difference between the superconducting state and the normal state; the ferromagnetic layer serves as a free layer capable of adjusting magnetization, and the magnitude of superconductive critical current of the superconductive layer is influenced through the magnetization direction. The heavy metal layer generates spin orbit torque through a spin Hall effect to drive the ferromagnetic layer to be magnetized and overturned; an infinite switching ratio between a superconducting state and a normal state is realized through a superconducting diode magnetoresistance effect, a high-efficiency and high-reliability nonvolatile storage scheme is realized in combination with a current-driven spin-orbit torque magnetization overturning technology, inherent defects of a traditional TMR are thoroughly overcome, and the signal contrast of a storage unit is remarkably improved; the heterostructure designed by the invention replaces a traditional magnetic tunnel junction, reduces material stacking and process complexity, and adopts a material compatible with a CMOS (Complementary Metal-Oxide-Semiconductor Transistor) process to promote large-scale integration of the low-temperature memory.
Owner:BEIHANG UNIV
Perpendicular MR SAF
PendingUS20250372300A1Vacuum evaporation coatingConductive/insulating/magnetic material on magnetic film applicationKryptonMagnetization
Method for forming a magnetoresistive element by forming a sense layer having a free sense magnetization, a reference layer having a fixed reference magnetization, wherein the reference layer is formed by deposition in a Krypton atmosphere, a tunnel barrier layer between the reference layer and the sense layer, and a hard layer having a fixed reference magnetization layer opposite to that of the reference layer. The magnetoresistive element may be configured to measure an external magnetic field oriented substantially perpendicular to the plane of the reference layer. The reference magnetizations of the reference and hard layers may be oriented substantially perpendicularly to the plane of the reference and hard layers. The sense magnetization may have a vortex configuration in the absence of an external magnetic field.
Owner:ALLEGRO MICROSYSTEMS LLC
Single-substrate full-bridge TMR magnetic field sensor and method of making same
The application provides a single-substrate full-bridge TMR magnetic field sensor and a preparation method thereof, and comprises four groups of MTJ devices connected into a full-bridge structure, two groups of MTJ devices on one pair of opposite bridge arms are located in a first region of a substrate, and two groups of MTJ devices on the other pair of opposite bridge arms are located in a second region of the substrate, wherein the two groups of MTJ devices in the first region have a first stack structure, comprising a first pinning layer, a coupling transition layer, a first reference layer, a first barrier layer and a first free layer which are sequentially stacked from bottom to top; the two groups of MTJ devices in the second region have a second stack structure, comprising a second pinning layer, a second reference layer, a second barrier layer and a second free layer which are sequentially stacked from bottom to top. The application can obtain MTJ devices with two different magnetization directions through only one external magnetic field magnetization.
Owner:ZHEJIANG HIKSTOR TECHOGY CO LTD
Magnetic tunnel junction device
According to one aspect of the inventive concept, there is provided a MTJ device comprising a layer stack, comprising a SOT layer and a first free layer, a second free layer, a reference layer and a tunnel barrier layer arranged between the second free layer and the reference layer, and a spacer layer arranged as an interface layer between the first free layer and the second free layer, wherein the SOT layer is adapted to switch a magnetization direction of the first free layer by SOT, and wherein the first free layer is adapted to generate a magnetic stray field acting on the second free layer such that a magnetization direction of the second free layer is responsive to the magnetization direction of the first free layer.
Owner:INTERUNIVERSITAIR MICRO ELECTRONICS CENT (IMEC VZW)
Magnet for a sensor and method of magnetizing the same
The application relates to the technical field of magnetic sensors, and specifically provides a magnet for a sensor and a magnetization method thereof, the magnet comprising: the magnet is in a circular-arc tile structure, and the length of the magnet is equal to or greater than the maximum displacement stroke capable of being detected by the sensor; the magnetization direction of the magnet adopts one of the length, thickness or circular-arc radial direction of the magnet. The magnetization method comprises the following steps: selecting the material of the magnet and determining the size of the magnet according to the maximum displacement stroke capable of being detected by the sensor, and manufacturing a magnet block in a circular-arc tile structure; determining the magnetization direction of the magnet according to the relationship between the magnetic induction intensity of the sensor and the rotary displacement position and the rotary angle based on the Hall effect; the magnetization direction adopts one of the length, thickness or circular-arc radial direction of the magnet; calculating the magnetization data of the magnet; and magnetizing the magnet block according to the magnetization direction and the magnetization data to obtain the magnet for the sensor. The application can improve the rotary displacement measurement precision of the sensor.
Owner:SUNWAVE ELECTRONICS CO LTD
Mixing bias magnetic nanoparticle magnetization sensing distance measurement method and device
The invention discloses a frequency mixing bias magnetic nanoparticle magnetization sensing distance measurement method and device, belongs to the technical field of magnetic sensing detection, and solves the problems that the distribution density of magnetic lines is quickly reduced along with the increase of spatial distance, and the concentration information is inaccurately restored under the condition that the distance is unknown in the prior art. According to the frequency mixing bias magnetic nanoparticle magnetization sensing distance measurement method and device, on the premise that a large number of coils are not additionally arranged, the space distribution of an excitation magnetic field near a sensor, the nonlinear magnetization characteristics of a superparamagnetic signal, the magnetization response distance and direction of a superparamagnetic particle and the like are analyzed in detail; the one-dimensional chromatography detection in the lymph node detection direction is innovatively realized, the depth and concentration information of the tracer agent can be synchronously detected and restored, and the detection accuracy of the sentinel lymph node magnetic sensitive detection technology is greatly enhanced.
Owner:SHENYANG UNIVERSITY OF TECHNOLOGY +1
Online detection device for health state of steel wire rope for traction
The embodiment of the invention provides an online detection device for the health state of a steel wire rope for traction. The device comprises an annular magnetic flux leakage detection piece, an excitation assembly and a controller. The controller controls the excitation assembly to perform constant current magnetization and pulse current magnetization on the to-be-detected steel wire rope; after the excitation assembly performs constant current magnetization or pulse current magnetization on the to-be-tested steel wire rope, the magnetic induction assemblies are started. Detecting the to-be-detected steel wire rope so as to respond to constant current magnetization of the to-be-detected steel wire rope to perform static magnetic field detection on different positions of the to-be-detected steel wire rope in the circumferential direction or respond to pulse current magnetization of the to-be-detected steel wire rope to perform transient magnetic field detection on different positions of the to-be-detected steel wire rope in the circumferential direction; the acquisition module acquires static magnetic field detection data of the plurality of magnetic induction assemblies and sends the static magnetic field detection data to the controller to enable the controller to obtain a static leakage magnetic field result, and is also used for acquiring transient magnetic field detection data of the plurality of magnetic induction assemblies and sending the transient magnetic field detection data to the controller to enable the controller to obtain a transient leakage magnetic field result.
Owner:BEIJING INST OF RADIO METROLOGY & MEASUREMENT
A natural gas pipeline stress detection method, device, equipment and storage medium
ActiveCN120992086BPipeline systemsApparatus for force/torque/work measurementMagnetic tension forceInternal pressure
The application discloses a natural gas pipeline stress detection method, device, equipment and storage medium, and belongs to the technical field of natural gas pipeline safety monitoring. The method comprises the following steps: establishing a saturated magnetic field in a target detection section of a natural gas pipeline; collecting magnetic flux density, spatial difference signals, internal pressure and temperature in the saturated magnetic field; correcting and interference suppressing the collected data; inputting the processed data into a magnetic-force coupling model to establish the correlation between the pipeline stress and the magnetic flux density and the magnetization parameters; sequentially compensating the magnetic flux density based on the temperature and the strain rate; and finally combining the correlation to construct an inversion cost function, inputting the compensated data to obtain the pipeline stress distribution of the target section. The application does not need to invade the inside of the pipeline, guarantees the stable correlation between the magnetic characteristics and the stress through the saturated magnetic field, eliminates the environmental and dynamic factor interference through double compensation processing, significantly improves the stress detection accuracy, and can provide data support for the safe operation and risk early warning of the natural gas pipeline.
Owner:XI'AN PETROLEUM UNIVERSITY
Magnetic identification sensor
PCT designated stageWO2025249527A1Paper-money testing devicesMagnitude/direction of magnetic fieldsMagnetizationCondensed matter physics
[Problem] To make it possible to adjust the magnetic field strength applied to a magnetic detection body regardless of the magnetization direction of a magnet. [Solution] A magnetic identification sensor 200 that moves a medium 100 that includes a magnetic body 110 along a transport surface 211 and detects a magnetic pattern for the magnetic body 110 is characterized by comprising a magnetic detection unit 300 at which a first magnet 520a and a magnetic detection element 410 are arranged in the given order along the movement direction of the medium 100 relative to the transport surface 211, the magnetic detection element 410 being fixed to a first holding member 420, and the first magnet 520a being fixed to a second holding member 530 that has a guide surface 531 that allows for movement relative to the first holding member 420 such that the directions in which movement are possible are restricted.
Owner:CANON DENSHI KK
Magnetoresistive effect element manufacturing method, magnetoresistive effect element, magnetic laminated film, magnetic memory, and magnetic sensor
PendingJP2025150014AManufacture of flux-sensitive headsThin magnetic filmsMagnetic memoryMagnetization
To provide a magnetoresistive element, a magnetic memory, and a magnetic sensor that are resistant to the influence of external forces such as heat and external magnetic fields and have high magnetization stability.SOLUTION: A magnetoresistive element includes a first ferromagnetic layer, a second ferromagnetic layer, a non-magnetic layer, and an underlayer. The non-magnetic layer is located between the first ferromagnetic layer and the second ferromagnetic layer. The first ferromagnetic layer is located between the underlayer and the non-magnetic layer. The underlayer contains Ta. The first ferromagnetic layer is expressed as CoαFeβXγPtδ, where X is boron or carbon, and α+β+γ+δ=1, α≥β>0, and δ≤0.3 are satisfied. The easy axis of magnetization of the first ferromagnetic layer is a first in-plane direction perpendicular to a stacking direction, and the anisotropy field of the first ferromagnetic layer in a second direction is 50 Oe or more. The second direction is perpendicular to the stacking direction and the first direction.SELECTED DRAWING: Figure 1
Owner:TDK CORP
Method for producing highly anisotropic magnet, method for producing magnet assembly, highly anisotropic magnet, magnet assembly, and composite magnet assembly
ActiveJP2025170067APermanent magnetsManufacturing dynamo-electric machinesEffective surfaceMagnetization
To provide a method for producing a highly anisotropic magnet and a method for producing a magnet assembly that offer higher design flexibility and improved economic efficiency, compared with existing techniques.SOLUTION: The method for producing a highly anisotropic magnet having four surfaces SF1, SF2, SF3, and SF4 includes: a magnetic-field forming step S20 in which a magnetic field in a first direction is applied to one effective surface VSF (SF1) among the four surfaces and magnetic fields in a second direction are respectively applied to the remaining three surfaces SF2, SF3, and SF4 while performing in-field molding; and a four-side magnetizing step S40 in which the magnetic field in the first direction is applied to the effective surface VSF (SF1) and the magnetic fields in the second direction are applied to the remaining three surfaces SF2, SF3, and SF4 to perform magnetization.SELECTED DRAWING: Figure 17
Owner:MIYAWAKI KOBO CO LTD
Magnetization rotational element and magnetoresistive effect element
ActiveUS12635420B2Magnetic measurementsManufacture of flux-sensitive headsMagnetizationElectric current flow
This spin current magnetization rotational type magnetoresistive element includes a magnetoresistive effect element having a first ferromagnetic metal layer having a fixed magnetization orientation, a second ferromagnetic metal layer having a variable magnetization orientation, and a non-magnetic layer sandwiched between the first ferromagnetic metal layer and the second ferromagnetic metal layer, and spin-orbit torque wiring which extends in a direction that intersects the stacking direction of the magnetoresistive effect element, and is connected to the second ferromagnetic metal layer, wherein the electric current that flows through the magnetoresistive effect element and the electric current that flows through the spin-orbit torque wiring merge or are distributed in the portion where the magnetoresistive effect element and the spin-orbit torque wiring are connected.
Owner:TDK CORP
Magnetic sensor, magnetic field detection device, position detection device, lens module, imaging apparatus, and method for manufacturing magnetic sensor
To provide a magnetic sensor applied to a magnetic field detection device that can accurately detect a magnetic field in a predetermined direction while being compact.SOLUTION: A magnetic sensor comprises a stacked structure in which a first layer including a magnetic yoke, and a second layer including a magnetic field detection element and a plurality of magnetic field generators each applying a magnetic field to the magnetic field detection element and arranged discretely along a first axis direction, are stacked in order in a second axis direction intersecting the first axis direction. The magnetic field detection element is interposed between two magnetic field generators selected from the plurality of magnetic field generators in the first axis direction. The magnetic yoke extends in the first axis direction, and is adjacent to the magnetic field detection element in a third axis direction intersecting both the first axis direction and the second axis direction in a plan view. Magnetization directions of the plurality of magnetic field generators are each inclined at less than 45° with respect to the first axis direction.SELECTED DRAWING: Figure 1B
Owner:TDK CORP
Detection of a rotation of a magnet in a user-borne device with a plurality of magnetometers
A user-borne device includes a housing and a magnetic object coupled to the housing. The magnetic object has a magnetization direction and the magnetic object is configured to create a magnetic field associated with the magnetization direction. The magnetization direction is oriented with respect to the magnetic object such that a rotation of the magnetic object about a first rotation axis, a second rotation axis and a third rotation axis, which are orthogonal with respect to each other, is detectable based on magnetic field measurements with a plurality of magnetometers. The user-borne device is configured to control at least one trigger event based on a rotation of the magnetic object about the first rotation axis, the second rotation axis and / or the third rotation axis.
Owner:ADVANCED MAGNETIC INTERACTION (AMI)
Preparation method of ferromagnetic annular rubber magnet
PendingCN121748152APermanent magnetsInductances/transformers/magnets manufactureVulcanizationMagnetization
The invention discloses a preparation method of a ferromagnetic annular rubber magnet, which comprises the following steps: providing a sheet material of the rubber magnet, and cutting the sheet material into strips to form a plurality of rubber magnetic strips; performing primary cold pressing treatment on the rubber magnetic strip, so that the two ends of the rubber magnetic strip are jointed to form a conical annular magnet; performing secondary cold pressing treatment on the conical annular magnet to form an annular magnet; and carrying out hot-pressing vulcanization, cooling shaping and magnetizing on the annular magnet in a high-intensity magnetic field to realize special magnetic circuit magnetization so as to obtain the ferromagnetic annular rubber magnet. According to the preparation method, the annular rubber magnet which is high in raw material utilization rate and has strong magnetism can be prepared.
Owner:EARTH PANDA ADVANCE MAGNETIC MATERIAL +1
Full-bridge reluctance sensor and electronic device
The application provides a full-bridge magnetoresistance sensor and an electronic device. The circuit structure of the full-bridge magnetoresistance sensor is a full-bridge circuit structure, and the long axis directions of each sensing unit on adjacent bridge arms in the full-bridge circuit structure are parallel. The sensing unit comprises a flip function layer, a dielectric layer and a magnetoresistance thin film arranged from bottom to top. The flip function layers of the sensing units on two parallel bridge arms are connected to the same current input end, and the flip function layers of the sensing units on the other two parallel bridge arms are connected to the same ground end. By applying a single current to the current input end, the current flowing through the flip function layers of the adjacent bridge arms is opposite, so that the pinning direction of the anti-ferromagnetic layer of the sensing unit in which the heat generated by the flip function layer and the local magnetic field are reversed is opposite, and then the magnetization direction of the reference layer in the sensing unit on the adjacent bridge arm is opposite, so that a complete full-bridge structure is realized on a single chip, and the effect of flexibly setting or resetting the reference layer direction after production or during use can be achieved.
Owner:青岛海存微电子有限公司
Core-shell nanoprobe, preparation method and application
The invention relates to the technical field of magnetic particle imaging, in particular to a core-shell nanoprobe and a preparation method and application thereof.The core-shell nanoprobe comprises a magnetic core and a nanoshell which is located outside the magnetic core and has a magnetic shielding response function, and the structure of the nanoshell collapses under the tumor microenvironment condition; the saturation magnetization of the magnetic core is greater than or equal to 50 emu / g, and the coercive force is less than or equal to 5 Oe; the saturation magnetization of the nano shell is less than 50 emu / g, and the coercive force is more than 5 Oe. According to the core-shell nanoprobe, through a unique magnetic core-shell structure design and tumor microenvironment response characteristics, a magnetic shielding layer is formed by using a low-signal nano shell with a response magnetic shielding function, and background signal interference is inhibited. In a tumor microenvironment, the shell structure of the core-shell nanoprobe collapses, the magnetic core is exposed, and a high magnetic signal is released and generated, so that the imaging signal-to-noise ratio is remarkably improved. According to the invention, the bottleneck that the traditional MPI probe is lighted in the whole course can be broken through, the tumor specificity is lighted and positioned, and the problems that the external background of the tumor is high, the contrast ratio is poor, and tiny focuses are difficult to detect are solved.
Owner:XIDIAN UNIV
Crankshaft surface magnetization field uniformity evaluation method for aviation nondestructive testing
PendingCN120908722AMagnitude/direction of magnetic fieldsMaterial magnetic variablesField uniformityAviation
The invention discloses a crankshaft surface magnetization field uniformity evaluation method for aviation nondestructive testing, and relates to the technical field of nondestructive testing, and the method comprises the following steps: carrying out detection pretreatment on a to-be-tested crankshaft to obtain a tested crankshaft, applying a forward magnetic field to the crankshaft according to a magnetic powder detection method, carrying out magnetic field intensity acquisition on the applied magnetic field, and calculating the uniformity of the applied magnetic field; obtaining a first magnetic field intensity signal; acquiring three-dimensional attributes of the tested crankshaft, dividing the crankshaft according to the three-dimensional attributes to obtain areas with the same attributes, analyzing the first magnetic field intensity signals on the areas with the same attributes, and determining abnormal signals existing in the first magnetic field intensity signals; determining the position of the crack based on the abnormal information to obtain first position information; and performing magnetic field change judgment on the first magnetic field intensity signal based on the first position information, determining a crack form, obtaining real position information in combination with the first position information, and outputting the real position information. The method has the effect of improving the crankshaft defect judgment accuracy.
Owner:CIVIL AVIATION FLIGHT UNIV OF CHINA
Azide coated magnetic particle and its use in qualitative and / or quantitative determination of at least one analyte
In a first aspect, the present invention is directed to a magnetic particle having a saturation magnetization ≥ 15 Am2 / kg and having at least one azide group –N=N'-N- bonded to a polymer matrix of the magnetic particle. A second aspect of the invention relates to a process for preparing a magnetic particle, which comprises at least one magnetic core (M), a polymer matrix (P) comprising a crosslinked polymer at least partially surrounding the magnetic core (M), the polymer matrix (P) comprising on its surface at least a functional group reactive towards amine groups and / or hydroxyl groups. In a third aspect, the invention is directed to the magnetic particle obtained or obtainable from the process of the second aspect. A fourth aspect is related to a process for preparing a magnetic particle having a saturation magnetization ≥ 15 Am2 / kg of the first aspect, and a fifth aspect relates to the magnetic particle obtained or obtainable from the process of the fourth aspect. A sixth aspect is directed to the use of the magnetic particle having a saturation magnetization ≥ 15 Am2 / kg of the first aspect or of the fourth aspect for qualitative and / or quantitative determination of at least one analyte in a fluid or in a gas, and a seventh aspect relates to a method for determining at least one analyte in a fluid using said magnetic particle having a saturation magnetization ≥ 15 Am2 / kg.
Owner:ROCHE DIAGNOSTICS GMBH
Iron removal rod and slurry filtering device
The utility model discloses an iron removal rod and a slurry filtering device. The iron removal rod comprises a plurality of magnetization units which are spliced in series, each magnetization unit comprises two or four magnets; one longitudinal side of each magnet is an S pole, and the other longitudinal side of each magnet is an N pole; a linear magnetization surface is formed at the intersection of the adjacent magnets of the magnetization unit, and the polarities of the sides, close to each other, of the magnets on the two sides of the linear magnetization surface are the same; the magnetization direction of the magnet of each magnetization unit meets the requirement that a strong linear magnetization area is axially formed on the side face, corresponding to the linear magnetization face, of the iron removal rod. According to the iron removal rod provided by the utility model, the magnetization unit adopts two or four magnets, the magnetic circuit layout is optimized, a strong linear magnetization area can be formed in the axial direction of the iron removal rod, the magnetic field intensity is enhanced, the adsorption area is enlarged, magnetic particles such as scrap iron in slurry are effectively adsorbed, and the efficiency and thoroughness of magnetic removal are improved; impurities can be prevented from forming a microbattery in the battery.
Owner:XIANGCI MAGNETIC IND (SHENZHEN) CO LTD